Supplementary material for "Homogenization of populations in the wildflower Texas bluebonnet (Lupinus texensis)." Here we sample 187 individuals in 12 matched pairs of neighboring wild and seeded populations of the Texas bluebonnet (Lupinus texensis), a species popular in commercially available wildflower seed mixes used by both the Texas Department of Transportation and the public. We use genotyping by sequencing to identify 11,741 genome-wide single nucleotide polymorphisms, as well as a smaller number of SNPs from the chloroplast genome, to analyze population structure and genetic diversity within and between the populations. Main parameters for the program STRUCTURE, confirming population structure from K=1 to K=5, with 10 iterations and a burn-in of 100,000 steps. To detect admixture and population structure amongst bluebonnet populations, we used the Bayesian clustering algorithm implemented in STRUCTURE v.2.3.4 (Pritchard et al. 2000) and following best practices recommended in Gilbert et al. (2012) and Janes et al. (2017). We used an admixture model with correlated allele frequency and location prior information identifying seeded or wild status.